... diversity of customers' demand, provided with GPS standard time signal input, and output signals types, like 1PPS/1PPM/1PPH ... or DCF77 output signal can also be added. Therefore, TF1581 can be used as master clock in centralizing time ... is the description of standard configuration, out-going output signal and quantity shown as follows:1PPS x 4, 1PPM ... 1, ALARM x 1. GPS Time Synchronizer reference clock